Create BUILD.md

BUILD.md

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+# Building
+
+## Windows
+
+1. Install node.js from the [node.js website](https://nodejs.org/en/)
+
+## Mac OS
+
+# TODO: please do this
+
+## Linux
+
+1. Install nodejs
+
+Debian/Ubuntu:
+
+# TODO: please test this
+
+```bash
+sudo apt install nodejs npm
+```
+
+Archlinux:
+
+```bash
+sudo pacman -S nodejs npm
+```
+
+2. Clone this repository
+
+```bash
+git clone https://github.com/GooseMod/OpenAsar.git
+cd OpenAsar
+```
+
+3. Run the commands to build the app.asar file
+
+```bash
+# Prerequisites
+npm install -g asar
+
+# Clean up previous builds
+rm app.asar
+
+bash scripts/injectPolyfills.sh
+
+# Set the version
+sed -i -e "s/nightly/nightly-$(git rev-parse HEAD | cut -c 1-7)/" src/index.js
+node scripts/strip.js
+
+# Build the asar
+npx asar pack src app.asar
+```